Exit-door lock.



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l/VVE/VTOR Patented Sept. 5, 1916.

r M Fm-zs- H. w. DYER, EXIT DOOR LUCK- A; ATT RNEY H. W. D'YER.

EXIT DOOR LOCK.

APPLICATION FILED JUNE 4.1913.

I. ,1 9?,1 1 1 I Patented Sept. 5, 1916.

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EXIT-DOGI-t LOCK.

Application filed June 4, 1913.

To all whom it may concern Be it known that I, HARRY W. DYER, a citizen of the United States, and resident of East Orange, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Exit-Door Locks, of which the following is a specification.

This invention relates to exit door loo-ks of the character designed to be opened from the inside only of a door and to operate quickly and with certainty when pressure is exerted against the door from the inside in case for instance of a panic from fire or other causes.

One object of my invention is to provide a lock of this character which will maintain the doors securely looked under ordinary conditions and in which the bolts cannot be thrust back upon pressure on their ends to effect unwarranted entrance to the building from the outside.

A further object of the invention is to provide a lock of this character in which there is no possibility of interference with the movement of its working parts by a crowd against the door.

Further features of the invention will appear from the following description when read in connection with the accompanying drawings wherein I have illustrated a preferred embodiment of the same.

In said drawings Figure 1 is an elevation of the inside of the door showing my invention applied thereto; Fig. 2 is a side view from the left of Fig. 1, Fig. 3 is a sectional view above the median line of Fig. 1; Fig. 4: is a perspective view of a detail; Fig. 5 is an elevation showing the invention applied to double doors. Figs. 6 and 7 are detail views showing modifications of the device which permits the unlocking of the doors from the outside.

In the drawings, 1 indicates the door which is hinged along its edges 2 to open outwardly. Adjacent the edge 2 of the door and at a height of about the usual position of the knob, a bracket 3 is attached in which is hinged a bar at extending across the face of the door substantially to the outer edge thereof. The upper and lower bolts 5 and 6 respectively are slidingly mounted in suitable brackets 7 and 8 and are provided with end dogs 9 adapted to engage suitable sock- Specification of Letters Patent.

Patented Sept. 5, 1916..

Serial No. 771,607.

ets 10 in the floor and an upper member of the door frame respectively. Each bolt is provided with a spring 11 compressed between the dogs 9 and suitable flanges of the brackets 8 to normally hold the bolts in their extended or locked position. To the inner end of each bolt there is attached a cross head 12, and connecting the cross heads on each side of the bolts are toggle links 13 and 14c of a length such that when the toggles are set with the links in line, the bolts are thrust into their sockets.

The middle joints of the toggle links he immediately under the bar 4, and formed on the inner face of the bar is a cam projection 15 having oppositely curved faces 16 and 17 adapted to engage the inner edges of the toggle links. When the bar is thrust to ward the door the pivots of the links 13 and 14 are forced away from each other, as indicated by the dotted lines in Figs. 1 and 3, thereby drawing the bolts together against the tension of their springs and retracting the dogs 9 from their sockets.

To support and guide the free end of the bar t I preferably provide the same with a device shown in Fig. 4: in detail. As here shown the cam 15 is provided with a recess 18 in which is pivoted a tongue 19 substantially smaller in section than the recess but projecting beyond the face of the cam. The tongue 19 works in a socket 20 attached to the face of the door between the toggle links, which socket is slightly smaller than the recess 18 so as not to interfere with the free inward movement of the bar 4, the pivot of the tongue permitting the bar to swing on its pivot without binding.

In Fig. 5 I have shown the arrangement of the device for double doors. In such doors, the door which carries the bolts is provided with a rib or flange 22 which overlies the outer face of the free edge of the other door so that a single pair of bolts will hold both doors locked. The bolt controlling mechanism is the same as that of the single door except that the end of the bar 4 is projected somewhat beyond the toggles as shown at 23 in dotted lines in Fig. 1, and the other door is provided with a bar 4- similar to the bar 1, and adapted to engage with its free end a seat or socket 24: provided on the end of the bar l. The bar 4 is preferably supported at its free end by a doors comes against the bars 1 or 4: the cam will be thrust toward the door therebyspreading the toggles and withdrawing the bolts so that the doors open freely. By supporting the bar near its free endalso it is held in operative position even though the crowd may be packed under it and hanging on it. in certain forms of exit door locks now in use the operating bar is pivoted for oscillating movement in a vertical plane. In some cases before the bar is operated in the proper manner to release the bolts, some person in the crowd may be thrown down and get their shoulder under the bar so that it cannot move vertically and consequently the doors will not open. I

A further important feature of my improved door is the arrangement of the toggles so that they are set when the bolts are locked. By this arrangement the bolts form in effect a substantially continuous bar so that anyattempt on the part of an intruder to force a lever under the end of either bolt and force it inward will merely have the effect of forcing the opposite bolt harder into its socket.

In Figs. 6 and 7 I have illustrated a modification of my improved door lock whereby the bolts may be released from the outside by a key in the usual manner but hold securely against unauthorized entrance. This mechanism comprises a knob 25 swiveled in a socket 26 on the outer face of the door and having a tubular shank surrounding a hollow shaft 27 projecting through the door and having a thrust bearing 28 carried by a socket 29 on the inner face in the position occupied by the socket 20 described above. Within the shaft 27 is a spindle 30 having spiral groove 31 in its outer surface into which projects a screw 32 set in the shaft 27. The spindle 30 projects into the socket 29 and is attached to the tongue 19 carried by the end of the lever 4:. The end of the shaft 27 is notched in any arbitrary manner to receive corresponding tongues on the end of a key 31 inserted in a key hole in the knob. The operation will be obvious. Unless the key is inserted in the knob the latter turns idlyin its socket without affecting the bolts. The insertion of the key locks the knob to the shaft 27, the rotation ofwhich relatively to the spindle 30 which is held stationary by the tongue 19, draws the bar 4 toward the door thereby spreading the toggles and releasing the bolts in the manner described.

Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. The combination of a door adapted to swing outwardly, a locking bolt normally held in position to lock said door, a bar mounted for movement toward and from the door, a pair of links pivotally mounted on the bolt, and means actuated by the bar on movement toward the door for spreading said links by pivotal movement in opposite directions and withdrawing said bolt.

2. The combination of a door adapted to swing outwardly, oppositely movable locking bolts for holding said door locked against movement, a link pivoted to each of said bolts and forming an extension thereof, said links being pivoted together to form a toggle joint between said bolts, a member mounted on said door for movement toward and from the door, and cam engaging said joint and actuated by said member for laterally shifting the joint of said toggle to withdraw said bolts.

3. The combination of a door adapted to swing outwardly, oppositely movable looking bolts for holding said door locked against movement, a pair of links pivoted to each of said bolts and forming extensions thereof, said links being pivoted together to form a pair of spaced toggles between said bolts, a member mounted on said door for movement toward and from the door, and means actuated by said member for laterally shifting the joint of said toggle in opposite directions to withdraw said bolts.

4. The combination of a door adapted to swing outwardly, a locking bolt normally held in position to lock said door, a bar adapted to move toward and from said door, and connected to said bolt to draw the said bolt on movement toward said door and a key controlled mechanism operatable from without said door for drawing said bolt, comprising a member connected to said bar, a rotatable member having a pin and spiral groove connection with said first mentioned member, and a key controlled device for rotating said last mentioned member.

Signed at New York in the county of New York and State of New York this 21th day of May A. D. 1913.

HARRY W. DYER.

WVitnesses W. B. MORTON, L. E. J OHNSTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

